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A method for reducing iron loss in desulfurization and slag removal of vanadium-containing titanium molten iron

A technology for desulfurization and desulfurization of molten iron, which is applied in the field of reducing iron loss of vanadium-containing titanium molten iron desulfurization and slag skimming, can solve the problems of large consumption of iron and steel materials, high iron loss of desulfurization and slag skimming, and high cost of molten iron desulfurization, so as to reduce the production cost of steelmaking. , Reduce the iron loss of desulfurization and slag skimming and the consumption of iron and steel materials, and improve the effect of slag state

Active Publication Date: 2015-10-14
PANGANG GROUP RESEARCH INSTITUTE CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to solve the problems of high iron loss during desulfurization and slag removal in the desulfurization process of molten iron containing vanadium and titanium, large consumption of steel materials, and high cost of desulfurization of molten iron

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0029] After the blast furnace smelting of vanadium-titanium magnetite, vanadium-titanium-containing molten iron is obtained. After the vanadium-titanium molten iron enters the desulfurization station, the weight is 200t, the temperature is 1260℃, and the composition is: C 3.9%, Mn 0.15%, V 0.30%, Si 0.18%, S 0.070%, P 0.073%, Ti 0.15% and other Amount of iron and unavoidable impurities. Add 1.25kg / t to vanadium-titanium iron water before desulfurization 铁水 Desulfurization and slagging agent, the composition of desulfurization and slagging agent is: CaO 30%, SiO 2 40%, Al 2 o 3 16%, Na 2 CO 3 9%, CaF 2 4.9%, S 0.05%, P 0.05%, use a slag remover to stir for 20 seconds, and then desulfurize. After the desulfurization is completed, the weight of the desulfurization slag is 10.5t, the slag is removed first, and when the desulfurization slag is removed to the remaining 5-5.5t, add 1.25kg / t 铁水 The above-mentioned desulfurization and slag adjustment agent is stirred for 2...

example 2

[0031] After the blast furnace smelting of vanadium-titanium magnetite, vanadium-titanium-containing molten iron is obtained. After the vanadium-titanium molten iron enters the desulfurization station, the weight is 250t, the temperature is 1350℃, and the composition is: C 4.4%, Mn 0.30%, V 0.45%, Si 0.38%, S 0.140%, P 0.120%, Ti 0.30% and other Amount of iron and unavoidable impurities. Add 1.75kg / t to vanadium-titanium iron water before desulfurization 铁水 Desulfurization and slagging agent, the composition of desulfurization and slagging agent is: CaO 40%, SiO 2 30%, Al 2 o 3 13%, Na 2 CO 3 9%, CaF 2 7.9%, S 0.05%, P 0.05%, use a slag remover to stir for 30 seconds, and then desulfurize. After the desulfurization is completed, the weight of the desulfurization slag is 13t, and the slag is removed first, and when the desulfurization residue is removed to the remaining 6.5-7t, add 1.75kg / t 铁水 For desulfurization and slag adjustment agent, use a slag removal machine...

example 3

[0033] After the blast furnace smelting of vanadium-titanium magnetite, vanadium-titanium-containing molten iron is obtained. After the vanadium-titanium molten iron enters the desulfurization station, the weight is 220t, the temperature is 1280℃, and the composition is: C 4.2%, Mn 0.27%, V 0.35%, Si 0.30%, S 0.086%, P 0.058%, Ti 0.27% and other Amount of iron and unavoidable impurities. Add 1.5kg / t to vanadium-titanium iron water before desulfurization 铁水 Desulfurization and slagging agent, the composition of desulfurization and slagging agent is: CaO 37%, SiO 2 38%, Al 2 o 3 12%, Na 2 CO 3 7%, CaF 2 5.9%, S 0.05%, P 0.05%, use a slag remover to stir for 20 seconds, and then desulfurize. After the desulfurization is completed, the weight of the desulfurization slag is 11t, and the slag is removed first, and when the desulfurization residue is removed to the remaining 5.5-6t, add 1.5kg / t 铁水 For desulfurization and slag adjustment agent, use a slag remover to stir f...

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Abstract

The invention discloses a method for reducing drossing iron loss for desulphurization of molten iron containing vanadium and titanium. The method comprises the following steps: adding a desulphurization slag adjusting agent to the molten iron according to the weight ratio of the desulphurization slag adjusting agent to the molten iron is (1.25:1000)-(1.75:1000); stirring and then desulfurating; after the desulfurating is completed, drossing the desulfurated molten iron; when the amount of the remaining desulphurization slag is 2 / 5-3 / 5 of that of the original desulphurization slag, adding the desulphurization slag adjusting agent to the remaining desulphurization slag according to the weight ratio of the desulphurization slag adjusting agent to the molten iron is (1.25:1000)-(1.75:1000); stirring, and drossing until all the remaining desulphurization slag is drossed. The desulphurization slag adjusting agent comprises the following components in percentage by weight: 30-40% of CaO, 30-40% of SiO2, 8-16% of Al2O3, 4-9% of Na2CO3, 4-8% of CaF2, 0.010-0.080% of S and 0.010-0.080% of P. According to the invention, under the premise of not affecting the quality of the molten iron, the production rhythm and the production organization, the slag state of the desulphurization slag of the molten iron is greatly improved, drossing iron loss and steel consumption during the desulphurization process of the molten iron are reduced, and the steelmaking cost is lowered.

Description

technical field [0001] The invention belongs to the technical field of smelting molten iron containing vanadium and titanium, and more specifically relates to a method for reducing iron loss during desulfurization and slag removal of molten iron containing vanadium and titanium. Background technique [0002] The characteristics of desulfurization of vanadium-titanium molten iron include high sulfur content and low temperature in molten iron, and because the blast furnace slag carried by vanadium-titanium molten iron is vanadium-titanium blast furnace slag, it has a high melting point, poor fluidity and more iron in the slag . However, after desulfurization of vanadium-titanium hot metal, the desulfurization slag state is relatively thin, and the slag-iron separation is more serious. Therefore, it is necessary to control the sulfur return amount of vanadium-titanium hot metal after desulfurization. Therefore, in order to reduce the sulfur return after desulfurization of vana...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C1/02C21C7/064
Inventor 蒋龙奎戈文荪陈永杜丽华陈炼王建黄正华董克平施敏张家利
Owner PANGANG GROUP RESEARCH INSTITUTE CO LTD
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